Originally Posted by mjd420nova
That's a busy question. I've had much better luck keeping the analog composite world seperated from the digital part. This has resulted from the impact that the HTPC concept has put on the video card makers and some semblance of a device to marry it all together. OTA broadcasts are free and unless an expensive tuner card is used, getting the content into the PC is problematic. Many newer PC units now have HDMI output ports but none I know of have HDMI inputs. Many fabulous units exist for studios and production work but are 20 times more expensive than any HTPC. Mixing HDMI parameters on an HTPC often leaves letterbox, huge side bars and all manner of format problems with the media that is not exactly compatible. All kinds of internet streaming boxes are hot now, along with netflix, etc subscriptions and a plethera of content from movies to series, new and old. As more and more HT hardware becomes "smart" the need for external devices or connections can be managed through a "streaming director" (router) to run multiple paths to multiple devices with one input stream.
That's a busy answer.
OTA in the US is all digital, ATSC (1080i) now, except for a very small number of very small local markets where NTSC is still in use.
All OP need is to switch from SDHRP to regular SDHR (aka dual) with an antenna and done.
OTA is an acronym for Over The Air meaning that somehow the signal has to be captured, and what better device to capture Over The Air signal than antenna? So, yes, OP, if you don't want to pay $35 for basic broadcast TV, than you need to build/buy antenna.
Depending on your location, you may get a ton of channels with a simple youtube/coat hanger antenna, or you may require a 500 foot mast to get half a dozen channels. It is all location dependent. .